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THE SUN: MAIN SOURCE OF The sun transfers ENERGY FOR LIFEits ONenergy EARTHto the earth and from there it can be transferred and transformed. Photo-synthesis means "putting together with light." Plants use sunlight to turn water and carbon dioxide into glucose. Glucose is a form of sugar. Plants use glucose as food for energy and as a building block for growing. Autotrophs make glucose and Heterotrophs are consumers of it. Why is Photosynthesis important? Makes organic molecules (glucose) out of inorganic materials (carbon dioxide and water). It begins all food chains/webs. Thus all life is supported by this process. It also makes oxygen gas!! Photosynthesis-starts to ecological food chains which will become food webs! Photosynthesis in Stages Glucose provides the energy and carbon needed to make other plant materials like wax and proteins. The photograph below is an elodea leaf at 400X. Individual cells are clearly visible. The tiny green structures within the cells are chloroplasts this is where photosynthesis happens. • In plants and simple animals, waste products are removed by diffusion. Plants, for example, excrete O2, a product of photosynthesis. Stoma This opening how plants exchange gases! Can you name the two important gases that go in and out of the leaves? Why are the stomata located on the underside of leaves? Chloroplasts producing oxygen! WHY ARE PLANTS GREEN? It's not that easy bein' green Having to spend each day the color of the leaves When I think it could be nicer being red or yellow or gold Or something much more colorful like that… Kermit the Frog Leaves are green because they contain the green pigment: chlorophyll Leaves have a large surface area to absorb as much light as "Thanks for the Glucose!" possible • Why do we see green? • Green color from white light reflected NOT absorbed • Chloroplast: organelle responsible for photosynthesis • Chlorophyll: located within Chloroplast • Green pigment Why are plants green? EQUATION FOR PHOTOSYNTHESIS Reactants Products WATER 6CO2 + 6H2O +ENERGY CARBON DIOXIDE OXYGEN C6H12O6 + 6O2 GLUCOSE Close up on a plant cell: Why are chloroplasts near the cell membrane and cell wall? Why do the chloroplasts circulate around the edges of the plant cell? Four factors affect photosynthesis: 1. Light – if there is more light photosynthesis happens faster 2. Water – if there is not enough water photosynthesis slows down 3. Temperature – the best temperature is about 300C – anything above 400C will slow photosynthesis right down 4. CO2 – if there is more carbon dioxide photosynthesis will happen quicker